Our research interest is to introduce new insights, and new aspects of quantum physics, by exploiting the interaction effects by manipulating electron wavefunctions in a controllable manner to allow technological exploitation of basic quantum physics and utilising the recent discovery on the self-organisation of fractional quantum states and electron spins. The major challenges to be investigated: spin and charge manipulation, demonstrating electron entanglement and detection, mapping self-organised fractional states and their spin states, controlled manipulation and detection of hybrid fractional states and establishing if they are entangled. Our research activity opens up a new area in the quantum physics of condensed matter with the possibilty of generation of Non-Abelian fractions which can be used in a Topological Quantum Computation scheme..
New: PhD opportunities. Scroll down for further details.
Sanjeev Kumar
Principal Investigator
We measure electron transport in nanoscale devices by forming one-dimensional (1D) quantum wires via the split gate technique and use a top gate to control the density and shape of confinement which defines the 1D channel..
We fabricate quantum devices using high quality GaAs/AlGaAs based III-V semiconductor heterostructures in a cleanroom by converting the high quality wafers in a Hall-bar geometry (shown in inset) and then performing electron-beam lithography to define split gates and top gate as shown above. The final device is wire bonded in a ledless chip carrier...
All the measurements are performed at mK range (<50mK) as the electron's mean free path is over 100's of micrometer therefore ballistic transport can be investigated at variety of experimental conditions.
Background image: Cryofree dilution refrigerators with superconducting magnet.
PhD Opportunities: PhD Studentship in “Quantum Engineering in Low Dimensional Semiconductors”
Duration of study: Full time-four years fixed term
Starting date: October 2019
Application deadline: Closing date for application is June 30, 2019 or until the position is filled.
Funding: This is a fully funded 4-year PhD studentship to cover the Home/UK and EU
students tuition fees plus a stipend of £16,777/year (2019/2020) tax-free for living costs
(increasing with inflation).
Please send your academic CV with an expression of interest to
Dr S Kumar (sanjeev.kumar@ucl.ac.uk) including contact details of three potential
referees.
For further details, click here